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FPGA and SoC SoM's can have fixed and user controlled Voltages for the I/O Banks. It is important to assure that the I/O Bank that controls the LED has a valid Supply Voltage applied.

If you are not sure about the I/O Banks Voltage supplies then there are some options to try.

NOTE: Missing VCCIO Voltage will not cause AXI GPIO to freeze, no matter if it is connected to MicroBlaze or Zynq Processing Block.

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